LT6600-10 Linear Technology, LT6600-10 Datasheet - Page 6

• Manufacturer Part Number: LT6600-10
• Description: Very Low Noise Differential Amplifier and 10MHz Lowpass Filter
• Manufacturer: Linear Technology

PI FU CTIO S
BLOCK DIAGRA
LT6600-10
6
IN
to either or both input pins through identical external
resistors, R
differential outputs is 402 /R
V
for the 2nd Filter Stage. Its value programs the common
mode voltage of the differential output of the filter. Pin 2
is a high impedance input, which can be driven from an
external voltage reference, or Pin 2 can be tied to Pin 7 on
the PC board. Pin 2 should be bypassed with a 0.01 F
ceramic capacitor unless it is connected to a ground
plane.
V
3.3V or 5V supply (Pin 6 grounded) a quality 0.1 F
ceramic bypass capacitor is required from the positive
supply pin (Pin 3) to the negative supply pin (Pin 6). The
OCM
+
–
U
and V
and IN
(Pin 2): Is the DC Common Mode Reference Voltage
–
U
+
(Pins 3, 6): Power Supply Pins. For a single
IN
(Pins 1, 8): Input Pins. Signals can be applied
. The DC gain from differential inputs to the
U
V
V
IN
IN
W
+
–
R
R
IN
IN
IN
.
8
1
IN
IN
+
–
+
V
–
402
402
OCM
OP AMP
–
+
V
V
MID
OCM
7
2
200
200
V
V
–
+
bypass should be as close as possible to the IC. For dual
supply applications, bypass Pin 3 to ground and Pin 6 to
ground with a quality 0.1 F ceramic capacitor.
OUT
the filter differential outputs. Each pin can drive a 100
and/or 50pF load to AC ground.
V
supply, see block diagram. For single supply operation the
V
capacitor to Pin 6. For dual supply operation, Pin 7 can be
bypassed or connected to a high quality DC ground. A
ground plane should be used. A poor ground will increase
noise and distortion. Pin 7 sets the output common mode
voltage of the 1st stage of the filter. It has a 5.5K
impedance, and it can be overridden with an external low
impedance voltage source.
11k
11k
MID
MID
+
V
V
pin should be bypassed with a quality 0.01 F ceramic
3
6
(Pin 7): The V
+
–
and OUT
+ –
V
–
200
200
OCM
PROPRIETARY
FILTER STAGE
+
LOWPASS
–
(Pins 4, 5): Output Pins. Pins 4 and 5 are
OUT
OUT
MID
4
5
–
+
6600 BD
pin is internally biased at mid-
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6600f